Altimeter



Nov. 3, 1931. L. BELUGOU 1,830,419

ALTIMETE R Filed July 8, 1930 2 Sheets-Sheet 1 g 1 l g? 771 m kW 7 F2 54- N 3 1.. BELUGOU 1,830,419

ALTIMETER Filed July 8, 1930 2 Sheets-Shea! 2 j /ajaxl I w v J Patented i-Nov. 1931 um'rao 'STATESTPATENT osmosmos meson, or am names.v

mnmrnn- Application fled July 8, 1880. Serial No. 408,5.

My invention has for its object an improved I altimeter of the type allowing the height of an object or its horizontal range to be 313081? tained through a more reading, the usual de- I fleeting means of the telemeter-altimeter disposed between the eye-piece and the object glasses providing a deflection proportional to the sine or cosine, according to the case, of the angle of sight of the plane containing the I ob'ect and the axis of the telemeter.

ow according to my invention the deflecting means are disposed between the eyepiece and only one of the object glasses and comprise two optic systems pr0v1din e ual and opposed deflections in the foca p ane of the object glass. These systems are provided with any desired device for restorin the coincidence between the images produce by the two object glasses and furthermore with means for giving each system equal and opposite rotary motions round the optic axis, which motions areproportional to the angle of sight.

I have shown by way of example on appended drawings a form of execution of my invention. V V Fi re 1 is a longitudinal section thereof and Tigure 2 a cross-section through line II-II of Figure 1. Figures3 and 4 show details.

As apparent from the drawings the optic deflecting arrangement comprises four prisms forming two systems 23 and 2'-3 disposed between the eyeieee E and one object glass 0, the other 0 ject glass not being shown. 4

The prism systems are each mounted in a sleeve such as4-4 provided with a toothwork meshing with a worm such as 5-5. The rotation of worm handwheel 6 moving prqportionallyto the angle of sight, said han wheel controlling through a suitable gear the angular position of the object glass carrying tube. The shaft of worm 5 carries a pinion 7 meshing with an equal pinion 7 on the shaft of which is keyed worm 5' meshing with the sleeve 4' of the system 2'3'.

In each system such as is integral with a sunwheel 2-3, each prism such as 8 of a difthe parallaxis 5 is controlled by the ferential gear comprising a lanet wheel, such as 9 controlled in its turn t ough a sliding rod arrangement 11 of variable length actuated by the knob 12 rotation of the prisms. e knob, re and planet wheel are connected through a Hookes or the like homokinetical joint whereby,

whatever the angular lposition of the rod 11,'

said rod rotates at t same speed as the ob on one hand and planet wheel on the other. 4 The knob 12 transmits the movement simultaneousl to the rod 11' and the planet pinion 9' o the system 2'3' through the pi'nions 13-43 and the small intermediary pinion 14'. A suitable control of the knob 12 provides therefore simultaneous restoration of coincidence for both prism systems.

The theory of this apparatus is as follows: Supposing that, d belng the angle of deflection of a rism, the prism 2 is caused to rotate throng an angle 0 by actuation of the knob 12 and the prism 3 conse uentl through an angle e in the opposite irection round the optic axis, the deflection provided by the system 2-3 will be 211 sin e. The deflection provided by the stem 2-3' will also be M sin e in the foca plane of the object glass. The total deflection will therefore be 4d sin e. N ow if the system 23 is bodily rotated in its sleeve through the angle S and consequently the stem 2-3' through the angle -S, the tota deflection in the focal object glass is: 4d sin e sin S.

This total deflection is of course equal to E B being the length of the telemeter and D the distance of the object aimed at.

Thus

g-az sin e sin s and. as the height H of the object aimed at is H=D sm S,

7 g d sin e. The height or altitude depends thus on the plane of the e 2 1,eso,ue

angle a and it may be read directly on the telemeter knob 12.

What I claim is 1. In an altimeter the provision of two optic deflecting systems comprising each two prisms and a common toothed socket frictionally1 holding same, a worm wheel engaging eac socket, common hand-actuated means for rotating the worms in op osite directions 10 through angles proportiona to the angle of sight, a sunwheel integral with each prism, a lanet wheel cooperatin with the two sun- 4 w eels of each system, a lescoping red for each planet wheei, a common knob for the two rods and homokinetical joints connectin the knob with each rod and each rod wi it! planet wheel, 1 2. In an altimeter the combination of an eye piece, an object-g ss, two optic deflecting N s ystema comprising each two elements, bot

systems being disposed to one side of the eye-- piece between the eye-piece and the objectglass, means for giving simultaneously to each system bodily opposite rotary motions round the optic axis proportional to the angle of sight, means for making the two elements 0 each system rotate in opposite directions through ual angles an means independent of the -mentioned means for 00 controlling the last-mentioned means and making1 the elements of both systems rotate throug the same angle.

In testimony whereof I aflix my signature.

. LEON BELUGOU. 

